Push to talk button Phone line powered Vandal resistant, stainless steel faceplate with heavy-duty metal call buttons Non-volatile E2 memory (no batteries required) Touch Tone or pulse dialing Programmable to dial up to 5 numbers on busy or ring no answer Red off-hook LED indicator Hangs up on CPC, silence, busy signal, return to dial tone, time out or a Touch Tone command Programmable to auto-answer on incoming calls Remotely programmable Extended temperature range (-15 F to 130 F) Flush mountable using included plastic rough-in box E-30-EWP has EnhancedWeather protection Optional VE-5x5 surfacemount back box E-30-EWP conforms to NEMA requirements